Apex Webservice Class

apex_webservice.cls

/**
 * Title
 *
 * @author 
 * @version 1.0
 * @description 
 * @uses  
 * @history
 * 		yyyy-mm-dd : 
 */
global class CaseServices {
    global class MultiRequest {
      webservice String req{get;set;}
    }
    global class MultiResponse {
      webservice String res{get;set;}
    }
    webservice static MultiRequest post(MultiRequest multiRequest) {
      return null;
    }
}